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Related Concept Videos

Channel Rhodopsins01:11

Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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A Rhodopsin Transport Assay by High-Content Imaging Analysis
12:11

A Rhodopsin Transport Assay by High-Content Imaging Analysis

Published on: January 16, 2019

Atomistic insights into rhodopsin activation from a dynamic model.

Irina G Tikhonova1, Robert B Best, Stanislav Engel

  • 1Laboratory of Biological Modeling, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Journal of the American Chemical Society
|July 16, 2008
PubMed
Summary

Researchers modeled the active form of rhodopsin (META II) using simulations. This dynamic model reveals key molecular mechanisms of rhodopsin activation and mutations, aiding GPCR drug discovery.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Molecular Pharmacology

Background:

  • Rhodopsin, a G protein-coupled receptor (GPCR), initiates visual signaling upon light absorption.
  • Activation involves conformational changes to metarhodopsin II (META II), engaging the G protein transducin.
  • Understanding rhodopsin activation mechanisms is crucial for GPCR-targeted therapeutics.

Purpose of the Study:

  • To develop a dynamic structural model of the active rhodopsin state (META II).
  • To investigate the molecular mechanisms underlying the lumi-rhodopsin (LUMI) to META II transition.
  • To correlate simulation dynamics with experimental data for wild-type and mutant rhodopsin.

Main Methods:

  • Biased molecular dynamics simulations and elastic network models were used.
  • Experimental distance restraints were applied to an existing lumi-rhodopsin structure.
  • Simulations characterized transmembrane helix motions and hydrogen bond rearrangements during activation.

Main Results:

  • A structural model of META II was generated, capturing key conformational changes.
  • The LUMI-to-META II transition dynamics were elucidated.
  • Simulated dynamics strongly correlated with the pharmacological phenotypes of rhodopsin mutants.

Conclusions:

  • The study identifies molecular mechanisms of rhodopsin activation in wild-type and mutant forms.
  • A dynamic activation model offers insights into GPCR pharmacology, including basal activity and ligand efficacy.
  • This approach can be extended to study other GPCRs and their interactions with ligands.